Properties and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Depreciation	$ 6,800	$ 8,300
Adjustments to retire property plant and equipment	1,600	8,600
Loss associated with disposal of property plant and equipment	300	100
Proceeds from sale of assets	$ (45)	(1,236)	$ (75)
Pretax gain on sale of assets		800
Impairment charge		$ 500